10 FPACH physical layer information field definition (1.28 Mcps TDD)
25.1233GPPRelease 17Requirements for support of radio resource management (TDD)TS
1.28 Mcps TDD introduces the FPACH (Fast Physical Access CHannel) which carries physical layer information. Two of these information fields are the ‘received starting position of the UpPCH’ (Uplink Pilot CHannel) and the ‘transmit power level command for the RACH message’. Both information fields are directly (received starting position of the UpPCH) or can be indirectly (transmit power level command for the RACH message) derived from measurements but are no measurements themselves.
10.1 Received starting position of the UpPCH (UpPCHPOS) (1.28 Mcps TDD)
The received starting position of the UpPCH (UpPCHPOS) is derectly derived from measurement, it is equivalent to the received SYNC-UL Timing Deviation for 1.28 Mcps. Its accurecy and range/mapping is defined in section 9.2.1.10. The information field value, UpPCHPOS -FIELD_LEV_xxxx, is equivalent to the reported value SYNC_UL_TIME_DEV_xxxx.
10.2 Transmit Power Level Command for the RACH message (1.28 Mcps TDD)
10.2.1 Accuracy requirements
Since this is a desired RX power at the node B and this is no measured value and the derivation of this value in the node B is implementation specific, accuracy requirements are not applicable.
10.2.2 Range/mapping
PRXPRACH,des FIELD is given with a resolution of 0.5 dB with the range [-120,-80] dBm.
PRXPRACH,des FIELD shall be transmitted in the FPACH.
Table 10.1
|
Information field value |
Measured quantity value |
Unit |
|---|---|---|
|
PRXPRACH,des FIELD_LEV_00 |
PRXPRACH,des < -120 |
dBm |
|
PRXPRACH,des FIELD_LEV_01 |
-120 ≤ PRXPRACH,des < -119.5 |
dBm |
|
PRXPRACH,des FIELD_LEV_02 |
-119.5 ≤ PRXPRACH,des < -119 |
dBm |
|
… |
… |
… |
|
PRXPRACH,des FIELD_LEV_79 |
-81 ≤ PRXPRACH,des < -80.5 |
dBm |
|
PRXPRACH,des FIELD_LEV_80 |
-80.5 ≤ PRXPRACH,des < -80 |
dBm |
|
PRXPRACH,des FIELD_LEV_81 |
-80 ≤ PRXPRACH,des |
dBm |
Annex A (normative):
Test Cases